Telephone Network

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The mayor of Townsville City wants to build a telephone network in the city. The city is represented as a square grid of size $N \times N$. Rows and columns of the grid are numbered from $1$ to $N$. Each cell of the grid $(i, j)$ has a tower of height $H_{i, j}$. The height of each tower is between $1$ and $K$ (inclusive). It is guaranteed that there is at least one tower of each height in the c

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solution.cppC++17

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